Topic-wise MCQs on Kinetics & Solutions from Physical Chemistry for B pharmacy students and as per PCI Syllabus | Free MCQs for GPAT and NIPER
Follow us on :-
Facebook:- Click here
Instagram:- Click here
Youtube:- Click here
Telegram:- Click here
1.The half-life period of first-order reaction is 1386 seconds. The specific rate constant of the
reaction is
a) 0.5 × 10-2s-1
b) 0.5 × 10-3s-1
c) 5.0 × 10-2s-1
d) 5.0 × 10-3s-1
2. The rate constant of a reaction A → B is 0.6 × 103 mole per second. If the concentration of [A]
is 5 M, then what will be concentration of [B] after 20 months?
a) 0.36 M
b) 0.72 M
c) 1.08 M
d) 3.60 M
3. Which of the following is affected by catalyst?
a) ∆H
b) ∆S
c) ∆G
d) Ea
4. The rate of first order reaction is 0.04 mol L-1s-1 at 10 sec. and 0.03 mol L-1 at 2C seconds after initiation of the reaction. t1/2 of reaction is
a) 44.1 s
b) 54.1 s
c) 24.1 s
d) 34.1 s
5. If the initial concentration of reactant is doubled, t1/2 is also doubled, the order of reaction is
a) zero
b) 1
c) 2
d) 3
6. If cone, of reactant ‘A’ is increased 10 times and rate of reaction becomes 100 times. What is
order with respect to ‘A’?
a) 1
b) 2
c) 3
d) 4
7.A first order reaction is 50% completed in 1.26 × 1014 s. How much time would it take for
100% completion?
a) 1.26 × 1015 s
b) 2.52 × 1014 s
c) 2.52 × 1028 s
d) infinite
8. Activation energy of a chemical reaction can be determined by __________
a) Determining the rate constant at standard temperature
b) Determining the rate constants at two temperatures
c) Determining probability of collision
d) Using catalyst
9. The half life of the first order reaction having rate constant K = 1.7 x 10-5s-1 is
a) 12.1 h
b) 9.7 h
c) 11.3 h
d) 1.8 h
10. What will be the fraction of molecules having energy equal to or greater than activation
energy, Ea?
a) K
b) A
c) Ae-Ea/Rt
d) e-Ea/Rt
11. Which of the following statements about the catalyst is true?
a) A catalyst accelerates the rate of reaction by bringing down the activation energy
b) A catalyst does not participate in reaction mechanism
c) A catalyst makes the reaction feasible by making ∆G more negative
d) A catalyst makes equilibrium constant more favourable for forward reaction
12. Rate law cannot be determined from balanced chemical equation if __________
a) Reverse reaction is involved
b) it is an elementary reaction
c) it is a sequence of elementary reactions.
d) Any of the reactants is in excess.
13. According to Maxwell Boltzmann distribution of energy, _________
a) The fraction of molecules with most probable kinetic energy decreases at higher temperatures
b) The fraction of molecules with most probable kinetic energy increases at higher temperatures
c) Most probable kinetic energy increases at higher temperatures
d) None of the above
14. Assertion: Order and molecularity are same.
Reason: Order is determined experimentally and molecularity is the sum of the stoichiometric
coefficient of rate determining elementary step
a) Both assertion and reason are correct and the reason is correct explanation of assertion
b) Both assertion and reason are correct but reason does not explain assertion
c) Assertion is correct but reason is incorrect
d) Assertion is incorrect but reason is correct
15. In Bimolecular reaction if one of the reactants is in excess it is called
a) Pseudozero order
b) Pseudofirstorder
c) PseudoSecond order
d) All of the above
16. SN1 (substitution nucleophilic reaction) in Tertiary halide is bimolecular but order is 1
a) True
b) False
c) Some time true and sometime false
d) None of the above
17. In the rate equation, when the concentration of reactants is unity then the rate is equal to
a) Specific rate constant
b) Average rate constant
c) Instantaneous rate constant
d) None of the above
18. Which of the following observations is incorrect about the order of a reaction?
a) Order of a reaction is always a whole number
b) The stoichiometric coefficient of the reactants doesn’t affect the order
c) Order of reaction is the sum of power to express the rate of reaction to the concentration terms of the reactants.
d) Order can only be assessed experimentally
19. The rate constant of zero-order reactions has the unit
a) s-1
b) mol L-1s-1
c) L2 mol-2s-1
d) L mol-1s-1
20. when the rate of the reaction is equal to the rate constant, the order of the reaction is
a) Zero order
b) first order
c) second order
d) third order
21. A catalyst alters, which of the following in a chemical reaction?
a) Entropy
b) Enthalpy
c) Internal energy
d) Activation energy
22. The time required for 100% completion of a zero order reaction is
a) a/2k
b) ak
c) 2K/a
d) a/k
23. Calculate the overall order of a reaction which has the rate expression
(a) Rate = k [A]1/2 [B]3/2
a) 1
b) 2
c) zero
d) 3
24. For which type of reactions, order and molecularity have same value?
a) If the reaction is elementary reaction, order and molecularity are equal
b) If the reaction is non elementary reaction, order and molecularity are non equal
c) Both a and b
d) None of the above
25. The molality of pure water is
a) 55.5
b) 50.5
c) 18
d) 60.5
26. The number of moles of NaCl in 3 litres of 3M solution is
a) 1
b) 3
c) 9
d) 27
27. 4L of 0.02 M aqueous solution of NaCl was diluted by adding one litre of water. The molality
of the resultant solution is ________
a) 0.004
b) 0.008
c) 0.012
d) 0.016
28. Low concentration of oxygen in the blood and tissues of people living at high altitude is due
to _________
a) low temperature
b) low atmospheric pressure
c) high atmospheric pressure
d) both low temperature and high atmospheric pressure
29. The temperature at which 10% aqueous solution of (W/V) of glucose will show the osmotic
pressure of 16.4 atom is (R = 0.082 L atom K-1 mol-1)
a) 360°C
b) 180 K
c) 300 K
d) 360 K
30. Which of the following condition is not satisfied by an ideal solution?
a) ΔHmixing = 0
b) ΔVmixing = 0
c) Raoult’s Law is obeyed
d) Formation of an azeotropic mixture
31. A solution containing 10 g per dm3of urea (molar mass 60 g mol-1) is isotonic with 5% solution of non-volatile solute, MB of solute is
a) 300 g mol-1
b) 350 g mol-1
c) 200 g mol-1
d) 250 g mol-1
32. Cone. H2SO4 is 98 % H2SO4 by mass has d = 1.84 g cm-3. Volume of acid required to make one litre of 0.1 M H2SO4 is
a) 5.55 mL
b) 10 mL
c) 20 mL
d) 30 mL
33. Benzoic acid, when dissolved in benzene, which of the following is correct
a) The benzoic acid will undergo dissociation
b) The benzoic acid will undergo association
c) Observed molar mass of benzoic acid in benzene will less than normal molar mass
d) Observed molar mass of benzoic acid in benzene is more than normal molar mass
34. Out of molality (m), molarity (M), formality (F) and mole fraction (x), those which are
independent of temperature are
a) M, m
b) F, x
c) m, x
d) M, x
35 . The number of moles of solute dissolved per dm3 of the solution is
a) molality
b) percentage
c) concentration
d) molarity
36. Camphor is often used in molecular mass determination because
a) It is readily
b) It has a very high cryoscopic constant
c) It is volatile
d) It is solvent for organic substances
37 .The vapour pressure of a dilute solution of a solute is not influenced by
a) Temperature of solution
b) Melting point of solute
c) Mole fraction of solute
d) Degree of dissociation of solute
38. 6.02*1020 molecules of urea are present in 100ml of its solution, the concentration of solution
is
a) 0.02M
b) 0.001M
c) 0.01M
d) 0.1M
39. How many grams of conc nitric acid solution should be used to prepare 250ml of 2.0M
HNO3? The concentrated acid is 70% HNO3.
a) 45.0g conc.HNO3
b) 70.0g conc.HNO3
c) 90.0g conc.HNO3
d) 54.0g conc.HNO3
40. 200ml of an aqueous solution of a protein contain its 1.26g .The osmotic pressure of this
solution at 300K is found to be 2.57*10-3 bar. The molar mass of protein will be (R=0.083L bar
mol-1K-1)
a) 61038gmol-1
b) 122044gmol-1
c) 51022gmol-1
d) 31011gmol-1
41. When initial concentration of a reactant is doubled in a reaction, its half life period is not
affected .The order of the reaction is
a) 1
b) 2
c) More than zero order but less than first order
d) Zero
42. Collision theory is applicable to
a) First-order reactions
b) Zero-order reaction
c) Bimolecular reactions
d) Intramolecular reactions
43. Rate of a reaction can be represented by Arrhenius equation as K= Ae-Ea/RT in this equation,Ea represents
a) The energy above which all the colloiding molecules will react
b) The energy below which colliding molecules will not react
c) The total energy of the reacting molecules at a temperature T
d) The fraction of molecules with energy greater than the activation energy of the reaction
44 . The weight percent of a solute in a solution is given by
a) wt of the solvent / wt of the solute ×100
b) wt of the solute / wt of the solvent × 100
c) wt of the solute / wt of the solution ×100
d) wt of the solution /wt of the solute × 100
45. The Henry’s law is applicable if
a) The temperature and pressure are moderate
b) The solubility of the gas in the solvent is low
c) The gas does not react with the solvent to form a new species
d) all of the above
47.When a saturated solution preapred at higher temperature is cooled, we get
a)super cooled solution
b) super saturated solution
c) an equilibrium mixture
d) one molar solution
48. In a saturated solution there exists an equilibrium between
a) Solvent and excess of solid
b) solution and excess of solid
c) Solid and excess of solvent
d) solid and excess of solution
49 .The completely miscible solutions can be separated by
a) A separating funnel
b) evaporation
c) Fractional distillation
d) none of these
50. Normality of a solution is the number of _______ of solute per litre of the solution.
a) moles
b) equivalents
c) formula weight
d) mole fraction
MCQs From Hospital and Clinical Pharmacy(include all chapters): Click here
MCQs on Introduction of Glycosides:-Click here
MCQs on Introduction of pharmacognosy :- Click here
Download and Read B pharmacy MCQs :- Click here
MCQs on Introduction of Lipids and Resins:Click here
Medicinal Chemistry :-Click here
Organic chemistry:- Click here
Pharmaceutical Analysis:- Click here
Cosmetic Notes:- Click here
Pharmacology:- Click here
Pharmaceutics :- Click here
Pharmacognosy:- Click here
No comments:
Post a Comment